This workaround doesn't work for me...
I can't risk having dozens of users who currently have multiple MAPI accounts no longer seeing the other shared calendars and therefore having to call them to reconfigure their Outlooks for this reason...
Unfortunately I will still have to wait for newer releases with additional BUGFIXes to come out before I can abandon stable 8664 and move on...
Gabriele Maoret - Head of SysAdmins at SERSIS
Currently manages 6 SmarterMail installations (1 in the cloud for SERSIS which provides services to a few hundred third-party email domains + 5 on-premise for customers who prefer to have their mail server in-house)